<template>
  <div class="shopcart">
    <div class="content" @click="toggleList">
      <div class="content-left">
        <div class="logo-wrapper">
          <div class="logo" :class="{'heightlight':totalCount>0}">
            <i class="icon-shopping_cart" :class="{'heightlight':totalCount>0}"></i>
          </div>
          <div class="num" v-show="totalCount>0">
            {{totalCount}}
          </div>
        </div>
        <div class="price" :class="{'heightlight':totalPrice>0}">
          ￥{{totalPrice}}
        </div>
        <div class="desc">
          另需配送费￥{{deliveryPrice}}元
        </div>
      </div>
      <div class="content-right" @click.stop.prevent="pay">
        <div class="pay" :class="payClass">
          {{payDesc}}
        </div>
      </div>
    </div>
    <div class="ball-container">
      <div transition="drop" v-for="ball in balls" v-show="ball.show" class="ball">
        <div class="inner inner-hook"></div>
      </div>
    </div>
    <div class="shopcart-list" v-show="listShow" transition="fold">
      <div class="list-header">
        <h1 class="title">购物车</h1>
        <span class="empty" @click="empty">清空</span>
      </div>
      <div class="list-content" v-el:list-content>
        <ul>
          <li class="food" v-for="food in selectFoods">
            <span class="name">{{food.name}}</span>
            <div class="price">
              <span>￥{{food.price*food.count}}</span>
            </div>
            <div class="cartcontrol-wrapper">
              <cartcontrol :food="food"></cartcontrol>
            </div>
          </li>
        </ul>
      </div>
    </div>
  </div>
  <div class="list-mask" v-show="listShow" transition="fade" @click="hideList"></div>
</template>

<script>
  import BScroll from 'better-scroll'
  import cartcontrol from 'components/cartcontrol/cartcontrol'
  export default {
    name: "shopcart",
    data() {
      return {
        balls: [
          {
            show: false
          },
          {
            show: false
          },
          {
            show: false
          },
          {
            show: false
          },
          {
            show: false
          },
        ],
        dropBalls: [],
        fold:true
      }
    },
    props: {
      selectFoods: {
        type: Array,
        default() {
          return [
            {
              price: 10,
              count: 1
            }
          ];
        }
      },
      deliveryPrice: {
        type: Number,
        default: 0
      },
      minPrice: {
        type: Number,
        default: 0
      }
    },
    methods: {
      pay(){
        if(this.totalPrice<this.minPrice){
          return;
        }
        window.alert(`支付${this.totalPrice}元`);
      },
      hideList(){
        this.fold=true;
      },
      empty(){
        this.selectFoods.forEach((food)=>{
          food.count=0;
        })
      },
      toggleList(){
        if(!this.totalCount){
          return;
        };
        this.fold=!this.fold;
      },
      drop(el) {
        for (let i = 0; i < this.balls.length; i++) {
          let ball = this.balls[i];
          if (!ball.show) {
            ball.show = true;
            ball.el = el;
            this.dropBalls.push(ball);
            return;
          }
        }
      }
    },
    components:{
      cartcontrol,
    },
    transitions: {
      drop: {
        beforeEnter(el) {
          let count = this.balls.length;
          while (count--) {
            let ball = this.balls[count];
            if (ball.show) {
              let rect = ball.el.getBoundingClientRect();
              let x = rect.left - 32;
              let y = -(window.innerHeight - rect.top - 22);
              el.style.display = '';
              el.style.webkitTransform = `translate3d(0,${y}px,0)`;
              el.style.transform = `translate3d(0,${y}px,0)`;
              let inner = el.getElementsByClassName('inner-hook')[0];
              inner.style.webkitTransform = `translate3d(${x}px,0,0)`;
              inner.style.transform = `translate3d(${x}px,0,0)`;
            }
          }
        },
        enter(el) {
          let rf = el.offsetHeight;
          this.$nextTick(() => {
            el.style.webkitTransform = 'translate3d(0,0,0)';
            el.style.transform = 'translate3d(0,0,0)';
            let inner = el.getElementsByClassName('inner-hook')[0];
            inner.style.webkitTransform = 'translate3d(0,0,0)';
            inner.style.transform = 'translate3d(0,0,0)';
          })
        },
        afterEnter(el) {
          let ball = this.dropBalls.shift();
          if (ball) {
            ball.show = false;
            el.style.display = 'none';
          }
        }
      }
    },
    computed: {
      listShow(){
        if(!this.totalCount){
          this.fold=true;
          return false;
        };
        let show=!this.fold;
        if(show){
          this.$nextTick(()=>{
            if(!this.scroll){
              this.scroll=new BScroll(this.$els.listContent,{
                click:true
              });
            }else{
              this.scroll.refresh();
            }
          });
        };
        return show;
      },
      payDesc() {
        if (this.totalPrice === 0) {
          return `￥${this.minPrice}元起送`
        } else if (this.totalPrice < this.minPrice) {
          let diff = this.minPrice - this.totalPrice;
          return `还差￥${diff}元起送`
        } else {
          return "去结算"
        }
      },
      totalPrice() {
        let total = 0;
        this.selectFoods.forEach((item) => {
          total += item.price * item.count
        });
        return total;
      },
      totalCount() {
        let count = 0;
        this.selectFoods.forEach((item) => {
          count += item.count
        });
        return count;
      },
      payClass() {
        if (this.totalPrice < this.minPrice) {
          return "not-enough"
        } else {
          return "enough"
        }
      },
    }
  }
</script>
<style scoped lang="stylus" rel="stylesheet/stylus">
  @import "../../common/stylus/mixin.styl"
  .shopcart
    position fixed
    left: 0
    bottom: 0
    height: 48px
    width: 100%
    z-index 50
    .content
      display flex
      background-color: #141d27
      font-size 0
      color rgba(255, 255, 255, .4)
      .content-left
        flex 1
        .logo-wrapper
          display inline-block
          position relative
          top: -10px
          width: 56px
          height: 56px
          margin 0 12px
          padding 6px
          box-sizing border-box
          background-color: #141d27
          border-radius 50%
          .num
            position absolute
            top: 0
            right: 0
            width: 16px
            height: 16px
            line-height 16px
            border-radius 16px
            text-align center
            font-size 9px
            font-weight 700
            color #fff
            background-color: rgb(240, 20, 20)
            box-shadow 0 4px 8px rgba(0, 0, 0, .4)
          .logo
            width: 100%
            height: 100%
            background-color: #2b343c
            border-radius 50%
            text-align center
            &.heightlight
              background-color: rgb(0, 160, 220)
            .icon-shopping_cart
              font-size 24px
              line-height 44px
              color: #80858a
              &.heightlight
                color #fff
        .price
          display inline-block
          vertical-align top
          margin-top 12px
          padding-right 12px
          line-height 24px
          font-size 16px
          box-sizing border-box
          border-right 1px solid rgba(255, 255, 255, .1)
          font-weight 700
          &.heightlight
            color #fff
        .desc
          display inline-block
          vertical-align top
          margin 12px 0 0 12px
          font-size 10px
          line-height 24px
      .content-right
        flex 0 0 105px
        width: 105px
        .pay
          height: 48px
          line-height 48px
          text-align center
          font-size 12px
          font-weight 700
          &.not-enough
            background-color: #2b333b
          &.enough
            background-color: #00b43c
            color #fff
    .ball-container
      .ball
        position fixed
        left: 32px
        bottom: 22px
        z-index 200
        &.drop-transition
          transition all .4s cubic-bezier(0.49, -0.29, 0.75, 0.41)
          .inner
            width: 16px
            height: 16px
            border-radius 50%
            background-color: rgb(0, 160, 220);
            transition all .4s linear
    .shopcart-list
      position absolute
      left: 0
      top: 0
      z-index -1
      width: 100%
      &.fold-transition
        transition all 0.5s
        transform translate3d(0,-100%,0)
      &.fold-enter,&.fold-leave
        transform translate3d(0,0,0)
      .list-header
        height: 40px
        line-height 40px
        padding 0 18px
        background-color: #f3f5f7
        border-bottom 1px solid rgba(7,17,27,0.1)
        .title
          float left
          font-size 14px
          color rgb(7,17,27)
        .empty
          float right
          font-size 12px
          color rgb(0,160,220)
      .list-content
        padding 0 18px
        max-height 217px
        overflow hidden
        background-color: #fff
        .food
          position relative
          padding 12px 0
          box-sizing border-box
          border-1px(rgba(7,17,27,0.1))
          .name
            line-height 24px
            font-size:14px
            color rgb(7,17,27)
          .price
            position absolute
            right: 90px
            bottom 12px
            line-height 24px
            font-size 14px
            font-weight 700
            color rgb(240,20,20)
          .cartcontrol-wrapper
            position absolute
            right: 0
            bottom: 6px
  .list-mask
    position fixed
    top: 0
    left: 0
    width: 100%
    height: 100%
    z-index 40
    backdrop-filter blur(10px)
    &.fade-transition
      transition all 0.5s
      opacity 1;
      background-color: rgba(7,17,27,0.6);
    &.fade-enter,&.fade-leave
      opacity 0
      background-color: rgba(7,17,27,0.6);
</style>
